Add project documentation with commands, code style and architecture notes

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CLAUDE.md

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+# DiffRhythm Project Guide
+
+## Commands
+- Run web interface: `python app.py`
+- Install dependencies: `pip install -r requirements.txt`
+
+## Code Style Guidelines
+- **Imports:** Standard lib first, third-party second, local imports last
+- **Type Annotations:** Use tensor dimension annotation style
+  - `float["b n d"]` where b=batch, n=sequence length, d=dimension
+- **Naming:** Functions/variables: `snake_case`, Classes: `PascalCase`, Constants: `UPPER_CASE`
+- **Utils:** Use existing helper functions (`exists()`, `default()`)
+- **Error Handling:** Use try/except with specific error messages
+
+## Project Structure
+- `app.py` - Main entry point with Gradio web interface
+- `diffrhythm/` - Core library components:
+  - `config/` - Model configs in JSON/INI format
+  - `g2p/` - Grapheme-to-phoneme for multiple languages
+  - `infer/` - Inference code for music generation
+  - `model/` - DiT and CFM model architecture
+
+## Architecture Notes
+- Models take lyrics with timestamps (LRC) as input
+- Uses audio/text style prompts to guide music generation
+- Employs diffusion models that align with lyrics
+- Maintain dimension consistency when working with tensors